Calculating machine



May 7-, 1946.

C. M. FRIDEN ET AL CALCULATING MACHINE Filed July 51, 1940 FIE 'L 1s Sheets-Sheet 1 Zhwcntors Car/ M. Fr/aer/ Ari/bony Machado (Ittorncg c. M. FRIDEN ET AL 7 2,399,917

CALCULATING MACHINE 15 Sheets-Shet 2 Filed July 31, 1940 g N? m (Ittorneg May 7, 1946. c. M. FRIDEN ET AL CALCULATING MACH'INE I 13 Sheets-Sheet 3 Filed July 51, 1940 Car/ M. Fr/a'en Kin/bony 5. Machado Gttorneg May 7, 1946. I c. M. FRIDEN ET AL i CALCULATING MACHINE Filed July 31, 1940 15 Sheets-Sheet 4 Ennentcrs Car/ M.Fr/'der1 Kin/hang B. Machaq'o Gttorneg y 7,1946- c. M. FRIDEN ETAL 2,399,917

CALCULATING MACHINE Filed July 51, 1940 15 sheets-Eben s FIE '7 F4IE E Snnentor 5 Car/ M. Fr/den Aim/hang 5, Machaa'o (Ittorueg May 7,1946. c. M. FRIDEN ET AL CALCULATING MACHINE Filed July 31, 1940 is Sheets-Sheet v Zinnentors Carl /W. Fr/dn 4n fh any 5. Math-ado (Ittdrneg May 7, 1946. c. M. FRIDEN ET AL CALCULATING MACHINE 1s Sheets-Sheet 8 Filed July 51, 1940 3nnentors C'ar/ M fHdn An/h any 5. Mac/rado attorneg May7, 1946. c. M. FRIDEN ET AL.

CALCULATING MACHINE Filed July 51. 1940 1a Sheets-$het a T L w -'-7 An/hony Machado Gttoruc May z, 1946.

C. M. FRIDEN ET AL CALCULATING MACHINE Filed July 31', 1940 15 Sheets-Sheet 11 Gttomeg May 7, 1946. c. M. FRIDEN E AL CALCULATING MACHINE Filed July 31, 1940 13 Shams-Sheet. 12

Ne ME AHH mHFm-w 3nnentors (ar/ IV. Fr/a'en Ari/hang '5. Macha do' Clttomeg view being taken as indicated by the line 4-4 mama May '7, 1946 UNITED STATES, PATENT oFncE CALCULATING momma California Application July 31, 134b, Serial No. 348,966

7 Claims. (Cl. 235-433) This invention relates to calculating machines and is concerned more particularly with the provision of improved means for performing plural order multiplication operations.

It is an bject of the invention to provide an improved calculating machine in which plural order multiplying operationscanqbe carried out" in an advantageous manner.

Another object of the invention is to provide an improved calculating machine capable of performing certain calculations such as compound interest, amortization, bond yield rates and the.

like in a simplified and expeditious manner.

Another object of the invention is to'provide an improved calculating machine of the character referred to in which the multiplying operation 1 can be selectively controlled by means of a plurality of manualhr operable control keys, each one of which selects certain characteristics of the operations being performed.

2 Another object of the invention is ,to provide an improved plural order multiplying mechanism for a calculating m'achine'in which the accumulator is left in the proper position for a division A or other operation at the end of the multiplica- 5 tion.

. I Another object of the invention is to provide an improvedmultiplying mechanism, for a calculatirig machine in which the registers of the machine can be properly conditioned for the multiplying 3 operation automatically. 7

Another object of the invention is to provide an improved calculating machine capable of carrying-out the foregoing objects and in which all the machine can operate continuously and unin- I terruptedly throughout the calculating operation.

Other. objectsand advantages will be apparent from the following description of a preferred embodiment of the invention as illustrated in the accompanying drawings, in which:

Figure 1 is a perspective plan view of a calculating machine embodying the invention;

Figure 2 is 'a longitudinal sectional elevation through the machine taken in a plane indicated by the line 2-2 in Figurel;

Figure 3 is a fragmentary sectional view Figure'4 is an elevational view partly in section showing certain of the control mechanisms, the

in Figure l;

-Figure 5 is a sectional elevational view of a part of the keyboard release mechanism;

Figure 6 is a plan view of one end of the carriage with the cover removed to illustrate a portion of the resetting control mechanism;

Figure '7 is a rear eievational view partly in section of the machine;

Figure 8 is a plan view of the shift drive mechanism, the view being taken as indicated by the line H in Figure '7; I

Figure 9 is an enlarged plan view of the lefthand portion of the machine with a part of the casing broken away to illustrate the multiplier control mechanism;

Figure 10 is a sectional elevation of a portion of the multiplier mechanism, the view being taken as indicated by the line Ill-Ill in Figure 9;

Figure 11 is a left side eievationai view of the machine with the cover removed and the base shown in section as indicated by the line ii-li in Figure 9;

Figure 12 is a sectional view of the multiplier ing, resetting, and multiplying operations;

) Figure His 6. view similar to Figure 11 with certain parts omitted and with the parts shown inthe operative position immediately after depression of one of the multiplier keys but before the operation of the machine starts;

Figure 15 is a fragmentary view of apart of" v\the control linkage as shown in Figure 13; of the power-driven operations'are performed by 35 .a single train of power flow from a motor whereby Figure 16 is a fragmentary view or a part of the control mechanism as positioned at the beginning of a multiplying operation after return of the accumulator to its end position;

Figure 17 is a fragmentary vertical section taken in a plane indicated bythe line I'I,I'| in Figure 1 1;

Figure 1a is an operational view similar to Figure 14 but showing the parts as positioned for shifting during the multiplying operation;

Figure 19 is an operational view showing the position of the parts after depression of the multiplier key I! which initiates both return and resetting of the accumulator as a preliminary to the multiplying operation.

General description (Figure 1) I The invention is described in a -preferred form as adapted to 9. Thomas type caiculating machine. Referring to Figure 1, the machine ineludes a body I! in which the actuatin selecting,

, keyboard clear key 23.

riage 18 which is mounted for endwise shifting movement transversely or body and which carries numeral wheels I1 and 18 of the accumu-' la'tor and revolutions counter, respectively. Numeral wheels 11 are provided with projecting twister handles Ila to provide for individual setting thereof. Carriage I6 can be shifted by power in either direction by manipulation of respective shift keys I9, 20 through mechanism described hereinafter.

Values are entered into the machine by depression of numeral keys 22 of the usual keyboard in the various ordinal rows thereof, keys 22 being releasable individually by depression of ordinal clear keys 22c, or'collectively by depression of The value set into the keyboard may be locked therein by proper setting of keyboard lock lever 26. Values introduced into the machine may be registered additively or subtractively on accumulator numeral wheels 1 by depression of plus key 25 or minus key 26, respec tively. If desired, add key 28 may be depressed to cause clearing of the keyboard in the usual manner after a single registration in the accumula or.

Values registered in numeral wheels i1 and it; can be erased, i. e., the registers can be zeroiaed,

by manipulation of respective manually operabie resetting handles 29, 30, or by power through depression of return and clear key 3!. Depres- 2,899,917 'and control mechanisms are mounted, and carfor supporting various mechanisms including the selecting and actuating mechanism.

The values to be introduced into accumulator numeral wheels I! are selected by means of a plurality of similar orders of selecting mechanism associated with numeral-keys 22. For this purpose, each bank or order of keys 22 (Figure 2) Y a bank, while the other slide 5 3 of an order 81011 of key 36 first eilects return of carriage i6 to the farthest left position and subsequently effects resetting of both the accumulator El and the counter it, either or neither, depending upon the setting of resetting handles 28 and 30 which are adjustable to control such selective resetting in a manner later described.

The machine is adapted to perform automatic plural order division by means of conventional construction including division starting control lever 32. Automatic predetermined multiplication can also be performed by depression of multiplier selection keys 34 to set up the desired multiplier figure as indicated on dials 35, and by I depression of one of multiplication keys 36, 31,

or 38 to start the multiplying operation. If accumulative multiplication is desired, the operation is begun by depression of accumulator multiply key which does not control operation of the resetting mechanism also. I! it is desired to correct an erroneously entered multiplier figure, multiplier correction key 39 may be depressed to zeroize the multiplier selection-mechanism. The multiplying mechanism and the associated control means form the principal subject matter of the instant invention, and are described later in detail. 1

With the above general organization .of parts in mind, various of the above noted mechanisms will be described in detail insofar as deemed necessary or desirable to an understanding of the present invention, it being understood that the mechanism which is not described fully may be of conventional construction, such as that disclosed inthe patents" to Friden 2,229,889 and 2,371,752.

Selecting and actuating mechanism (Figures 2, 3, and 6) c connected by various cross frame members including transverse brackets l1, 40, II, and

cylinders 58.

cooperates with a pair of similar parallel springurged value selecting slides 54 mounted for endwise movement by a suitable supporting linkage and extending through suitable slots in cross frame plate 49. Each slide 54 is provided with cam surfaces of varying inclination for cooperation with suitable pins on certain keys 21 to effect a differential movement of slide 54 on depression of a key 22.] One slide H of each order cooperates with the to 5" keys 22 of cooperates with the 6 to 9 keys 22 of the bank.

Each bank of keys 22 (Figure 2) has a latching slide 55 of conventional construction assoelated therewith to latch any depressed key 22 releasably in depressed position against the tension of the spring associated therewith. To release depressed nnmeral keys, the latching slides 5% may be operated in any convenient manner by zero and clear keys 22a and 23, and by power as controlled by depression of add key 28 as later described.

Each selecting slide 54 (Figure 2) is connected at its rear end with a ten-tooth gear 58 slidably and non-rotatably mounted on longitudinal square shaft 51, whereby movement of slide 54 serves to position the associated gear 56 on shaft 51 with respect to stepped teeth of the associated actuating cylinder 58 in accordance with the value 01' the depressed numeral key 22. A pair of actuating cylinders 58 for adjacent orders of the machine are mounted on each longitudinal actuating shaft 6|, which is suitably journalled in cross plates l8 and 48 and has a suitable bevel gear connection with transverse shaft 62. Shaft 62 is operable cyclically in a, Single direction from clutch controlled driving means as described hereinafter to provide the only path of power flow from the motor.

As seen in Figure 2, the "pair of square shafts 51 associated with each actuating shaft 6| are positioned above and to either side thereof, while the sets of gears 56 on respective square shafts 51 are offset longitudinally of the machine for cooperation with theslmilarly offset actuating By the above arrangement and upon each rotation of the actuating means, a

5 selected number of increments of movement can be imparted to each shaft 51 by the associated actuating cylinder 58 in accordance with the adiusted position of gears 58.

Each shaft 51 (Figures 2 and 3) is suitably journailed in cross plates-41, 48, and 45, and between plates 41 and 48 has associated therewith selectively settable plus-minus gears for driving an aligned numeral wheel 11. The plus-minus gears of each order .of the machine include a spool 1| slidably and non-rotatably mounted on shaft 51 v and havingopposed ten-tooth bevel gears 12, 13 arranged for selective engagement with gear 14 'Handis on numeral wheel shaft 15. The engagement of gears 12 and 15 with gear 14 is controlled by strap 11 which extends transversely of the machine between each set of plus-minus gears 12, mounted by similar spaced arms II on transverse shaft 15, which is suitably iournalled in side plates 55 and I0. Shaft 15 is controlled in a manner hereinafter described to determine able pawls I55, I31 having respective springs I28 associated therewith. Slots I55 are adapted for engagement by opposite shift pins I on shift gear I42 suitably iournalled on cross plate 41. Shift gear I42 (Figures '1 and 8) can be rotated selectively in either direction through idler gear I45 to shift the carriage through any desired number of ordinal spaces, each one-h'alf rotation of gear I42 effecting one ordinal spacing of the carriage. Shift gear I42 is centralized by means of cam I44 and centralizing arms I45 having a suitable spring I41 connected therebetween.

In order to rotate shift gear I42 selectively in either direction the two right hand actuating shafts 5| (Figure 8) are extended and are provided with similar controllable drive connections with ear I42. Each connection includes a collar I45 fixed on the associated sh'aft 5I adjacent the end thereof and having opposite-teeth slidably engaged by corresponding slots I45 of shift able collar I5I, which is mounted for sliding movement at the end of shaft 5|. Respective collars I5I have smaller teeth I52 for operative engagement with corresponding slots in gear sleeves I53 and I54. Gear sleeve I55 is suitably Journalled in cross plate 41 and bracket I55 secured in spaced relation on plate 41, and carries gear I55 meshing with wide idler gear I51 (Figures '1 and 8) which also meshes with idler gear I43. Similarly gear sleeve I54 (Figure 7) has gear I55 which meshes with idler gear I45, and has a similar controllable drive connection with an actuating shaft 5|.

'Thus, by selective shifting of collars III 'toestablish a drive connection, rotation of one of actuating shafts 5I may be utilized to determine rotation of shift gear I42 in a selected direction it: eflect shifting of carriage I5 in either direc- Similar mechanisms are provided to control shifting of collars I5I. Each mechanism includes a fork I5I (Figures 7 and 8) at the rear end of respective rods I52'and I55 and engaging a suitable annular groove in the associated collar I5I. Each of the rods I52, I55 is suitably mounted on the frame for endwise movement and is springurged to the position shown in Figure 8 by spring means (not shown). Left shift rod I52 has associated therewith a pin I54 (Figure 13) carried by arm I55 depending from sleeve I55 Journaled .on shaft in which smut carries arm In enga in pin I54. Shaft I51 and arm I55 may be oscillated through arm I55 by shift key 25 to shift the associated rod I52. Rod I52 is engaged by roller "I carried by arm I12 depending from sleeve I15 which carries arm I14 for operation by shift key I5, Keys I5 and "carry respective pins I15 (Figure 4) overlying. the upper ends of arms I14 and I55 and also overlying suitable cam surfaces of cam plate I11 (Figure 4) secured on lever 55, so that depression of a shift key rocks lever 55, clutch controllever 5I, and circuit control lever 55 to therebyengage the clutch and close the motor circuit asdescribed in connection with plus and minus keys 25,25.

Thus. c rriage. I5 carrying numeral wheels I1,

through one or more ordinal positions by depression of keys I5 and to control the cyclic operation of the actuating means.

Revolutions counter (Figures 2 and 3) Numeral wheels I5 (Figure 3) of the revolutionscounter register the number of actuations of accumulator numeral wheels I1 in a conventional manner by the operation of counter actuator I15, as disclosed, for example, in said Patent No. 2,229,889.

Resetting mechanism (Figures 2, 4-7, and 13) Means are provided for restoring the machine to normal condition between successive operations by shifting the carriage to a predetermined position and by then effecting zero resetting of ative upon depression thereof to establish a drive connection between the power driven resetting mechanism and the actuating means and to inicarrying pin 255.

' shown) tiate a carriage shifting and register resetting operation. 'Key 5| is mounted in a suitable manner on side plate adjacent shift key 25 for substantial endwise movement and is suitably connected to effect rocking movement of shaft 25I (Figures 4 and 5) upon depression of the key. The linkage for effecting such rocking movement may include arm '252 (Figure 13) To engage the drive, shaft 25I has depending arm I5'I (Figures 5 and 13) carrying a pin luengaging arm I pivoted on shaft I54. Arm I55 has finger I55 (Figure 4) engaging a pin I55 so that levers 55 and 55 are operatedjo engage the clutch and close motor circuit contacts 55. Before the drive begins key 2| also controls the engagement of shift and resetting drive connections.

To initiate the carriage return determined by depression of key 5I, shaft 25I carries arm 255 (Figure 13) having pusher link 251 pivoted thereon at 255 and urged downwardly by spring 255. Spring 255 urges notched end 2I I of link 251 into engagement with pin 2I2 carried by arm 2I5 secured on sleeve I55 previously described as operative to control left shift rod I52. Thus rocking movement of shaft 2" in the direction of the arrow in Figure 13 serves to operate rod I52 to establish the shift drive connection for left-hand shifting.

The rocking of shaft 25I upon depression of key 5| also serves to enable the drive connection from the actuating means to the resetting drive means mounted on the frame of the machine. For this purpose, shaft 2" (Figures 2 and 13) which is rocked upon depression of key 5| carries arm 2I5 having pusher link 2" pivoted thereon at 2I5 and urged by spring 2I5 to engage its notched end 22I with rod 222 slidably mounted in brackets 45 and 45 and normally positioned as shown in Figure 2 by a suitable spring (not Pusherlink 2H and arm 2I5 are similar to link 251 and arm 255, respectively. At its rearwardendrodlfl (l'igureszand'll carriee fork 225 op ntively engaged with shiftable I5 can be shifted selectively in either toothed lll to collars III. of a asaaan shift mechanism and similarly mounted on one of actuating shafts 31. .The teeth of collar 221 are engageable with the slotted end of sleeve 223- suitably journalled in bracket 41 and plate 229 secured thereon. Sleeve 223 (Figure "1.) carries cam 231 which is engaged by roller232 on am 233 pivoted at 234 on bracket 49 and urged tolward cam 231 by spring 233.

The upper end of arm 233 (Figure 7) is slotted to engage roller 231 suitably iournalledpn pawl 233 pivoted at 239 on slide 241 mounted for endwise movement on bracket 49 by small brackets 242 when carriage 13 is in its left end position as illustrated in Figure '1, pawl 233 is in operative relation with arm 243 pivoted at 244 on bracket 243 depending from a resetting drive member comprising slide 241.' Slide 241 an L-shaped cross section and is mounted for endwise sliding movement on carriage 13 by spaced studs 243. As described later, reciprocation of slide 241 can be utilized to reset either or both of the registers. Ann 243 has live one-way acting pawl 231 pivoted'thereon intermediate its ends to cooperate with fixed ledge 232 mounted on-bracket' 41 to lift arm 243 out of the path of pawl 233 during movement of the carriage ifito its end position. Spring 234 urges arm 243 to the position shown against a suitable stop on the carriage frame.

With the parts positioned as illustrated in Figure '1, it is seen that upon movement of slide 241 to the left, lateral pawl 233 will engage the end.

of arm 243 to reciprocate resetting drive slide 241. The reciprocation of slide 241 is effected in the first cycle during which the carriage is in the end position shown in Figure 7.

Slide 241 (Figure 6) may be operativelyrelated to either or both of resetting rack bars 236 and 231 of the accumulator and counter, respectively,

by the adjustment of settable control means to adjust the connections therebetween. For this purpose one end of slide 241 is provided with lateral extension 232 projecting transversely of bars 233 and 231 and provided with respective pins 233 and 234 providing abutments for driving the rack bars. Preferably, the settable control 'means for engagement with pins 233 and 234.

comprise the operating handles 29 and 33 for bars 233 and 231 of similar construction. Handle 23 (Figure 6) is pivoted on post 211 .secured' in upright position at oneend of rack bar 233.

Handle 29 carries connecting arm 212 which has seat 213 for selective engagement with pin-233 on slide 241. Handle 33 is similarly constructed being provided with connecting arm 213 for en-,

pin 234 on extension 232 of slide 55 EaEement with From the foregoing it is seen that by selective adjustment of connecting arms 212 and 213, operation of either or both of rack bars 233 and 231 by slide. 241 can be predetermined, so that-both the accumulator or the revolutions counter, or, either of them, will-be reset to zero upon depression of key 31.

Key 31 may be latched 'in depressed position during shifting of the carriage to its end position, if displaced therefrom, and the latch may be released during the first cycle of operation of the actuating means when in said end position as disclosed in said Patent No. 2,294,083 under control of override pawl 133 (Figure '1) Override pawl 133 also serves to interrupt operation of the shift and resetting drive connections after the first cycle (resetting cycle) following the shifting operation. For this purpose, slide 231 (Figures 4 and '7) is mounted for endwise73 may movement. onxbracket 41 for operation by pawl 133 upon oscillation thereof by shift pins 141.- Slide 231 (Figure 4) overlies an arm ofbelicrank 232 pivotedon shaft 19 on plate 43 and pivotally connected to link 234 which is also pivotally connected to arm 233 (Figures 4 and '13) depending, from shaft 231 suitably mounted on the frame.

Shaft 231 (Figures 2, 4 and 13) carries arms 238 and 239-underlying pusher links 231 and 211, re-'.

spectively.

Thus upon rocking movement of override pawl 133, during the resetting cycle, the above describedlinkage operates through arms 233 and 239 (Figare 13) to lift pusher links 231 and 211, which results in release of shift push rod 132 and resetting push rod 222, respectively, causing disengagement of the shift and resetting drive connections.

Multiplier keyboard (Figures 1, 9, and IO The selection mechanism for the multiplier figure isof the type disclosed in said Patent Number 2,371,752. Generally, such mechanism comprises a ten-key keyboard including keys 34 (Figure 10), and a pin carriage 331 associated therewith, having ten ordinal rows of settable stop' pins 332 and ten ordinal differentially adjustable elements 333 (Figures 9 and 10) in the form of racks in which digits of the multiplier be set successively for'subsequent control of the multiplying operation. In order to set up the a multiplier digits, each pin-row includes eight pins corresponding to 1" to"8 keys and a fixed stop corresponding to the 9 key, so that a depressed multiplier key operates through-an associated selection lever 334 to set the corresponding pin of an aligned ordinal row to active or raised position. At the same time that a pin of the pin carriage is moved to active position, the aligned rack is released to move into engagement with the pin and thereby be set differentially in accordance with the value of the depressed key. Subsequent.-

vly, the depressed *key operatesan escapement mechanism (not shown) to move the pin carriage one ordinal step with respect to the keyboard selection mechanism.

In this manner, the multiplier digits are set up in the multiplier selection mechanism, the setting operation beginning with the highest order digit do! the multiplier in the embodiment illustrated.

As shown in Figure '1, a setting has been made corresponding to live successive depressions of the key :4. v

' {Multiplier rack restoring means Figures 9 and 10) The difierentiallyadjusted positio s of' rack 4 333 are utilized to control the number of registrations of the multiplicand in the accumulator so and to shift, the accumulator from 1m to right after multiplication by each' multiplier digit to enable correct registration of the next ordinal product, as well as'to shift the pin carriage so that thenext higher order rack 333 comes into controlling position with respect to the operation of the machine. To enable exercise of the above control, means is provided for returning each adjusted rack step-by-step to itsinitial position, this operation being successive from the adjusted 73 rack of lowest order with the shifting of the accumulator and the multiplier pin carriage following the last step of movement of each rack to condition the machine for'operation in the next higher order.

The operating mechanism for the racks comprises feed pawl 3| 1 (Figure which is pivotally secured at H2 at the end of an arm 313 pivoted at 3l4 on the frame. Pawl 3 is urged in a counter-clockwise direction as viewed in Figure 10 by spring 3I3 which is attached at one end to lug 3l1 of pawl 3| I. Lug 3" is spaced from arm 3l3 in the inactive position of pawl 3H and en-. gages arm M3 to limit the rocking movement of, the pawl upon movement to active position. Pawl 3 is held in inactive position by its upward extension 313 engaging behind holding pawl 313 which is secured at the end of shaft 32l which is suitably pivoted in the framework. Both pawls 3H and M3 are maintained inactive until the multiplying operation is started, the inactive position being shown in Figure 10.

In order to actuate pawl 3! I, arm 313 (Figure 10) is pivotally connected to pitman 323 (Figures 9 and 10) which engages an eccentric cam (not shown) secured on shaft 32 between discs 321. Pitman 323, arm 313, and pawl 3 are reciprocated once for each cycle or rotation of shaft 32, and the operation of the pawl 3| 1 in its active direction occurs at the beginning of each cycle. However, the pawl 3| l is held in inactive position until holding pawl M3 is allowed to move in a counter-clockwise direction from the position.

shown in Figure 10 by oscillation of shaft 32 I.

Multiplication keys (Figures 12 and m a The condition of the machine for the multiplying operation as controlled by the multiplication operation keys will now be described. when one of keys 33, 31, or 33 is depressed and latched in depressed position, several functions of the machine are set into operation selectively in accord ance with the type of operation determined by the key depressed. These functions include en-' abling of the control which determines the sign character of the registration of the product, en

abling of the power set means for operating the sign character control, enabling of the carriage shift mechanism to determine return 'of the carriage to an end position, selective enabling ofthe resetting mechanism for the accumulator and the revolutions counter, setting the control for enabling feed pawl 31 l for the multiplier racks, engaging the clutch, and enabling the motor circuit. The mechanisms performing these functions and their relation to multiplication keys 33,

a 31, and 33 will nowbe described.

333 which is suitably pivoted on. vertical frame plates 334 and 333 of the multiplier unit. Latch lever 331 is urged in a counter-clockwise direction as viewed in Figure '12 by spring 333 suitably tensioned between the frame and the lower end of lever 331. The lower end of lever 331 is also operatively related with arm 34! of bellcrank 342 whereby the latch forthe depressed key 33 01- 31 can be released at the end of the multiplying operation as later described. Suitable interlocking means may be provided for preventing simultaneous depression of keys 33 and 31.

Registration sign character control (Figures 9, 10, 11, 12, and 17) Means are provided under control of multiplication keys'for selecting the sign character of the a registration of the product in the accumulator to be positive if keys 33 or 33 are depressed, and to be negative if key 31-is depressed, such means being enabled by depression of a selected key and subsequently operated by power means also enabled by depression of the key. Pins 343 (Figures 9, 11 and 12) of keys 33 and 31 extend through the adjacent frame plate and engage in respective slots of the forward ends of levers 331 and 332 respectively, which are offset laterally intermediate their ends to extend beyond the adjacent plate 334 (Figure 9) and have their hubs 334 and 333 pivoted on shaft 333.

Lever 33! (Figures 9, 11 and 12) has pin 331 at its rearward end engaging a vertical slot in arm 333 pivotally mounted at 333. Arm 333 is,

connected by spring 331 with positive setting arm 332 which is pivoted at 333 to power setting means therefor in the form of bell crank 334 pivoted at 333 on frame plate 43. Arm 332 i urged upwardly by spring "I against a roller 333 on arm 333, so that in effect arms 333 and 332 move with lever 33! upon depression of key 33. At its rearward upwardly offset end arm 332 has notch 333 for engagement with pin 331 at the upper end of lever 333 secured at the end of transverse shaft 1'3 whose rocking movement, as previously described, moves gate 11 to control the engagement of the plus-minus gears with the numeral wheel gears and therefore control the sign character of the registration.

' Normally notched end 333 of arm 332 is maintained below pin 331 as shown in Figure 12, but can move to active position into engagement with pin 331 under influence of spring 33l when key 33 is depressed to move lever 33| to active position as shown in Figure 14. It will be noted that spring 33I provides a yieldable connection whereby arm 332 can be held against movement to active position or moved from active position. Arm 332 engages pin 333 on lever 333 pivoted at 313 on the frame and having ear 311 overlying stop 312 on pin carriage 33! in the right-hand position of carriage 3M and the active rack 303 in any shifted position. Therefore, unless a value is set into the pin ca rriage, no setting of arm 33 as illustrated in Figure 12 rocks arm "I to raise the rearward end thereof to allow notched end 333 of arm 332 to move into engagement with pin 331, whereby upon subsequent counter-clockwise movement of bellcrank 334, lever 333 and shaft 13 will be moved to mesh the plus gears with the numeral wheel gears. Similarly, if key 31 is depressed, lever 332 serve to control the engagement of notched end 313 of arm 314 with pin 311, thereby conditioning the plus-minus control mechanism to determine negative registration of the product in the accumulator. As

' from key SI or key. 38.

and also an extension 4 of lever Ill.

explained above, however, thearm-Ifl or arm v l" pivoted at l". The horizontalarm of bell.-

"I of an crank 881 is pivotally connected to link I which i also pivotally connected to arm as so that counterclockwise (Figure 12) movement of arm 3 pulls link ll forwardly and rocks bellcrank 381 in a counter -clockwise direction to lift arm "I to tension spring "I so that arm 382 is urged,

upwardly to engage notched end I" with pin 1., The slotted connection of pin "1 with arm 3" provides for selective tensioning of spring Iii Thus, each of key- N, 31, and 38 controls the setting of linkage which in turn will. cause setting of the plus-minus gears upon oscillation of power setting bellcrank 3N.

To effect power setting of vided on bellcrank 3 (Figures 12 and 17) for cooperation with'power setting earn 402 which is slidably and non-rotatably'mounted on shaft 62 by a suitableslidabledriving connection. Cam

"2 is normally urged to inactive position, as

shown in Figure -17, by spring 406 compressed beits lower cam end engaged by roller 4 carried at the end of a lever ll! (Figure 11) pivoted at 1 on frame plate 3. Lever ll is spring urged in aclockwise direction as viewed in Figure 11 through its pivotal connection at lit with bell crank M! which is pivoted at'fll. 'Bellcrank 4|! is urged in a counter-clockwise direction by spring 22, therefore also placing lever 4|! under a clockwise urgency.

- Means are provided for preventing such elock-' wise movement of the lever lit to enable the v theplus-minus sears by oscillation of hell crank 3, roller "I is proof a multiplication 20.

by a suitable roller at the upper end of a lever II I v pivoted at 2 on the frame plate lit and having 3|. U-shap'ed lever "I is rocked through haft ill and arm l (Figure 10). a

As explained hereinafter, shaft 4 (Figure 11)' carrying pawl m is osoillatedatthe end of the carriage shifting or carriage shifting andresetting operation to disable latch pawl 430 and enable the power setting operation. j

To prevent re-latching of a multiplication key in depressed'position if held there after the multiplying operation, latch lever "8 (Figure 11). has pivotally mounted thereon at I a bellcrank 2 carrying a pin 3 overlying the lower arm of U-shaped lever 429. Lever 2 is urged in a clockwise direction by spring 4 and has its upright end adjacent and normally above pin 6 on an arm-l securedon shaft ll. which also carries key latch arm 331 (Figure 12') As previously exp'lained, the shaft III is operated upon depression key so that it will rock arm 1 upwardly and immediately downwardly when the key latch engages so that pin 6 provides a stop for bellcrank 2. Subsequently when the key release mechanism is operated, if the key is maintained depressed (i. e., lever 42! does not operate to restore bellcrank 2) the upright arm of bellcrank 44! will move imder pin 6. to maintain the ke latch inactive. a At the end of the carriage shifting or carriage shifting and resetting operation, the power setting bellcrank I is moved to active position and means .are provided for latching said bellcrank and the plus-minus gears controlled thereby in active position. Such'means may comprise latch arm "I (Figure 12) pivoted at! on plate 45 and urged in a counter-clockwise direction by spring till, Latch arm "I has notched lower end "I for engagement with pin 4" on bellcrank I. v I

Thus, the bellcrank 3 can be latched inactive position where its lower endis moved away from stop 45 as shown in Figure 16. The latch arm "I can be moved to inactive position by'arm "l in a manner later described. v

Carriage return and resetting control (Figures I, 7, 9 $0 11, and 13) I Upon depression of either of multiplication operation keys I. or 31 means are brought into power setting operation; such mechanism being first conditioned by operation of one of the mul-' tiplier keys and then subsequently enabled at the end of the shifting, or shifting and resetting operation. The forward end of lever I" is provided with an offset ear engaged by the upper arm of a bellcrank 428 pivoted at 421 on the frame and urged in a counter-clockwise direction by spring 428. Thus bellcrank l2 latches lever lll against operative movement. For releasing the latch bellcrank 42', U-shaped lever '42! secured on shaft 383 is provided with a pin "1 overlying the horizontal arm of bellcrank 428 v and a roller 43% lying under-portions of levers ill and III which are operated by the key depression Thereplay toflrst determine shiftin of the carriage to its leftend position as apreliminary to the multiplying. operation. Where a resetting operation is desired, key a is operated and a return and resetting operation may be performed to selectively reroize the accumulator, the counter, or both in accordance with the adjustment of the resetting mechanism.

Key I (Figures 9 and 13) carries a pin 4'" which engages the slotted end of a lever 412- pivoted at "I on frame plate 3". See also Figure 2.

fore, upon depression of key It or 31, the vertical I power setting enabling lever I from the key arm of bellcrank 42' is moved from beneath the Lever 412 carries a pin "4 engagingarm 2L6 se cured on shaft Ill. Arm ill as previously described operates through pusher link Il'l to move J push rod 2!! of the resetting mechanism to operative position; so that upon depression of the key v 3., push rod 122 engages the resetting drive connection. At the same time, the oscillation of shaft 20 I serves to oscillate arm 20. carrying pusher link I". which operates through pin 2 i2 and depending arm iii, sleeve I, arm "Land pin I to move push rod it: into position to engage the left 1 hand shift mechanism.

The oscillation of shaft ill also operates througharm ill and pin I02 to oscillate arm I" pivoted on shaft ill, iinger III of which (Figure \4) engages pin Ill at the lower end of lever 88 so that the circuit is closed and the clutch engaged- 

